201109588 六、發明說明： 【發明所屬之技術領域】 本發明是有關於一種具有稜形齒肋反射面導光體之 線性光源’特別是一種可以產生預定的照度分佈，對於 聚焦鏡頭與CCD影像感測器形成互補效應的線性光 源，以應用於高解析度之傳真機、印表機及掃描器。201109588 VI. Description of the Invention: [Technical Field] The present invention relates to a linear light source having a prismatic rib reflecting surface light guide body, in particular, a predetermined illuminance distribution can be generated for a focus lens and a CCD image sense The detector forms a linear light source with complementary effects for high resolution fax machines, printers and scanners.
【先前技術】 目前掃描器、傳真機、多功能周邊事物機及影印機 等圖像讀取裝置已廣泛使用於文件儲存或傳送，這些設 備之核心之一為光學引擎模組100(optical engine module)，如第1圖，包含光源（light source)l、反射鏡片 組 140(reflection mirrors)、取像鏡頭 120(pickup lens)及 影像感測器130(image sensor);當光源1發出光線投射 在文件55上，文件55反射光線，經由反射鏡片組 多次反射後，由取像鏡頭120聚焦於影像感測器13〇 成像，所成的影像（image)經由影像感測器B〇轉變上 子訊號。其中，影像感測器130最常使用光輕合元件成電 charge coupling device)，因此光學引擎模組又稱為 〇 合元件模組（CCDM，CCD module) 100。 光1執 光源1常使用冷陰極管（CCFL，cold fluorescent lamp)，但因CCFL需要額外的電壓轉攝 且含有S素元素不符合環保要求，近年已漸被發& @ ath °de (LED，light emitting diode)取代；如美國 專 极 201109588 US20040095620提出使用lED為掃描器的光源。led具 有節省電力及壽命長的優點，然而，使用LED為掃描器 的光源也存在LED光線分佈不如CCFL均勻，使掃描解 析度無法提高或產生明暗不均勻的文件反射光線，因此 常/、月ti使用於低速知描器（l〇W_Spee(J SCanner) 〇 通常光搞合元件模組（CCDM)的光源所發出的光線 要月b /函蓋待知描文件的寬度（appr〇ximateiy same length as a width 〇f the document)，如日本專利 JP11-232912提出使用LEd為光源，在各種柱面鏡（r〇d lens)後端排設LED陣列，以使其照度均勻化，以應用於 掃描器中。 為使光源發出光線均勻，台灣專利TW579640及美 國專利US20050088705揭露不同的掃描器的集光裝置， 其係利用集光元件及導光元件將光源發出的光線引導至 待掃描的文件上。另外，如日本專利jp2〇〇3262735揭露使 用窗狀的反射面以應用於背光模組的導光板（light quide plate);如台灣專利TWI24586，則揭露一種具有鋸齒狀 反射面之線狀光源，具有鋸齒狀反射面及一弧狀出射面 的導光棒，使發光二極體陣列發出的光線經由導光體而 達均句化的目的。US20090015884、US20090015886 則 揭1出在導光體側面設置光源，而於導光體反射面設置多 偃1反射凹槽，以產生均勻的光線分佈。 然而，由於取像鏡頭之光學鏡片（optical lens)的聚焦 曲面（focal surface)影響，光線射入取像鏡頭後，經由取 201109588 像鏡頭聚焦，在取像鏡頭的邊緣之出射的光線強度較 Μ 弱，相對使CCD周圍接受的光線強度較弱；在副掃描 方向均勻照度的光溽，會造成文件影像邊緣較暗，難以 提高掃描器的解析度。如第2圖，為高速高解析度 CCDM使用的CCFL(或氙氣燈）照度分佈及結構示意 圖，當燈管電極72驅動氙氣燈管71發出光線，經由特 定的長度與照明安排’使待掃描文件上副掃描方向（sub scanning direction)照度分佈形成U形的相對照度分佈 • 73，副掃描方向在光源中心74照度較低、兩端較高的 照度，可以補償CCD周圍光線強度較弱，使光耦合元 件模組（CCDM)可以產生均勻強度的影像訊號。另如第 3圖，美國專利US20050195452提出在柱面鏡92(rod lens)後端排設LED陣列91(LED Array)，藉由排列的 LED陣列91加以控制各LED的亮度，使發出的光線在 待掃描文件上的照度（illumination)能形成均勻或形成U 形的照度分佈，藉以改善副掃描方向的均勻性，以取代 φ CCFL應用於高速掃描器中。然而，採用導光體後端使 用LED陣列等技術手段，需要許多的LED單體及複雜 的控制。另一種技術方案是將光源設置於導光體端面， 如第4圖，在光源發出端設置端蓋（end cap)81，避免大 部份的光線由接近端面出逸出，並在多角形的導光體 82設置齒狀反射面（reflective tooth) 82卜以使光源發出 的光線能充份反射以增加光線的利用性，並以不同的齒 形形狀與齒形間距以調整光線射出後的光型。然而，多 角形的導光體與不同的齒形間距，增加製造的困難，成 201109588 本難以下降。 因此，為簡化製造及降低成本，發展在導光體端面 設置LED光源以減少LED使用量，並以便於製造，且 在出射面於副掃描方向形成與文件影像互補的U形照度 分佈、在主掃描方向形成線性集中的照度分佈，將符合 高解析度與高速掃描目的使用。 【發明内容】 本發明之目的為提供一種具有稜形齒肋反射面導光 體之線性光源，係應用於具有取像鏡頭與CCD影像感測 器之光耦合元件模組（CCDM)，線性光源包含一導光體、 一反射蓋及二個發光二極體（LED);其中，導光體係由光 學材料製成，設有入射面、反射面、二折射面及出射面， 反射面與出射面係對應設置，發光二極體（LED)設置於導 光體兩端之入射面；二折射面分別設置於反射面之兩 側；導光體之反射面為具有複數個棱形齒肋結構，每一 稜形齒肋結構設有一切角面，利用反射面將射入導光體 反射面的光線反射至出射面；在主掃描方向出射面為凸 面，其凸面為面向物體側；使發光二極體（LED)發出的光 線由入射面進入，經由反射面反射、折射面折射，由出 射面射出後，可在被照物體（如待掃描文件）上，於主掃 描方向（main scanning direction)形成線性集中（linear convergence)的照度分佈，於副掃描方向形成U形的照 度分佈（illumination distribution)，以補償CCD周圍光線 201109588 強度較弱的現象，形成互補效應，以產生均勻光強度的 影像訊號。 本發明之另一目的為在導光體之入射面設置一入射 凹面’該人射凹面之中心位於該二個發光二極體中心袖 ，線之光軸上’用以提南導光效率，減少光線散溢，提 高導光體出射面的平均照度。 本發明之再一目的為在導光體之出射面，於副掃描 方向設置為凹面，相對於光線出射方向為凸面，用以進 一步提高導光體出射面的兩端照度的強度。 由此，本發明之具有稜形齒肋反射面導光體之線性 光源，其可具有一或多個下述優點： (1) 藉由本發明提出之稜形齒肋反射面的導光體與 安排於兩侧入射面之L E D光源，可以改善習知技藝使用 夕個LED《源的直接照射方式的高成本與複雜控制的 缺點。 (2) 藉由本發明提出之導光體的稜形齒肋反射面的 ，構’可在主掃描方向形成線性集中的照度分佈、在副 掃描方向形成u形的照度分佈，用以補償CCD周圍光 線強度較弱的現象’形成互補，產生均勻光強度的影像 訊號，提供高解析度、高速掃描之需求。 (3) 藉由本發明提出之導光體在出射面設置凹面之 結構（相對於光線出射方㈣凸面）或人射面設置凹面之 結構，可以提高光線利用效率，相對增加光強度。 201109588 【實施方式】 為使本發明更加明確詳實，兹列舉較佳實施例並配 5下列圖不，將本發明之結構及其技術特徵詳述如後。 =參閱第5圖，其係為本發明具有稜形齒肋反射面 :先體之線性光源第一實施例示意圖。請參閱第6圖係 為本發明具有稜形齒肋反射面導光體之線性光源之反射 。請參閱第7圖，其係為本發明實施例之反射 盍不思圖。線性光源1包含一個導光體1〇、一反射蓋Η ^個發光二極體(LED)(lla、llb)，·其中，導光體1〇係 由先學材料製成，設有人射面15、反射面13、二折射面 及出射面12 ’反射面13與出射面12係對應設置，發 光二極體(LED)⑴a、Ub)設置於導光體1()兩端之入射 面15 ;二折射面17分別設置於反射面13之兩側，用以 將先線折射，·在主掃描方向（γ方向）出射面12為凸面， 其凸面為面向物體側，其曲率半徑為。其中，導光 體10之反射面13為具有複數個稜形齒肋 一稜形齒肋m結構設有一切角面132，利用反^面^ 將射入導光體10反射面13的光線反射至出射面12，如 第8圖至第10 11 ;其中，化為切角（Chamfer angle)角度， 為切1面132與反射面13所形成的角度，c為切角面%2. 在，掃描方向的投影長度，W為導光體1〇在主掃描方向 之寬度，d為兩個齒形反射肋的距離，η為反射面13至 =射面12頂點的長度’為導光桿的高度，Ηζ為稜形齒肋 底部至出射面12頂點的長度。其關係式如下：[Prior Art] At present, image reading devices such as scanners, facsimile machines, multi-function peripherals and photocopiers have been widely used for file storage or transmission. One of the cores of these devices is the optical engine module 100 (optical engine module). As shown in FIG. 1 , a light source 1, a reflection mirrors 140, a pickup lens 120, and an image sensor 130 are included; when the light source 1 emits light, On the file 55, the file 55 reflects the light, and after being reflected by the reflection lens group multiple times, the image capturing lens 120 is focused on the image sensor 13 to form an image, and the formed image is converted into an image via the image sensor B. Signal. The image sensor 130 is most commonly used as an electric charge coupling device. Therefore, the optical engine module is also referred to as a CCDM (CCD module) 100. Light 1 is usually a cold fluorescent tube (CCFL), but because CCFL requires additional voltage transfer and contains S element, it does not meet environmental requirements. In recent years, it has been issued & @ ath °de (LED , light emitting diode); as in the United States, 201109588 US20040095620 proposes to use lED as the light source of the scanner. Led has the advantages of saving power and long life. However, the light source using the LED as the scanner also has the LED light distribution not as uniform as the CCFL, so that the scanning resolution cannot be improved or the light and dark unevenness of the document is reflected, so often /, month ti The light emitted by the light source of the low-speed sniffer (l 〇W_Spee (J SCanner) 〇 usually the light-emitting component module (CCDM) is required to be the width of the document to be known (appr〇ximateiy same length as a width 〇f the document), as proposed in Japanese Patent No. 11-232912, using LEd as a light source, and arranging LED arrays at the rear end of various cylindrical lenses to uniformize illumination for application to a scanner In order to make the light source emit light evenly, Taiwan Patent No. TW579640 and US Pat. No. 2,005,088, 705 disclose different light collecting devices of the scanner, which use the light collecting element and the light guiding element to guide the light emitted by the light source to the document to be scanned. For example, Japanese Patent Jp 2 〇〇 3262735 discloses the use of a window-shaped reflecting surface for a light quide plate of a backlight module; for example, the Taiwan patent TWI24586 discloses a A linear light source having a sawtooth reflecting surface, a light guiding rod having a sawtooth reflecting surface and an arc emitting surface, so that the light emitted by the light emitting diode array is uniformly guided by the light guide body. US20090015884, US20090015886 discloses that a light source is disposed on the side of the light guide body, and a plurality of reflective grooves are disposed on the reflective surface of the light guide body to generate a uniform light distribution. However, due to the focus of the optical lens of the image taking lens The influence of the surface (focal surface), after the light is incident on the image taking lens, the light is emitted by taking the lens of the 201109588 image, and the intensity of the light emitted from the edge of the image capturing lens is relatively weak, so that the light intensity received around the CCD is relatively weak; The uniform illumination of the pupil in the scanning direction will cause the edge of the document image to be dark, which makes it difficult to improve the resolution of the scanner. As shown in Fig. 2, the CCFL (or xenon lamp) illumination distribution and structure diagram used for the high-speed high-resolution CCDM. The lamp electrode 72 drives the xenon lamp 71 to emit light, and the sub-scanning direction of the document to be scanned is made through a specific length and illumination arrangement. Degree distribution forms a U-shaped contrast distribution. 73. The sub-scanning direction has a lower illumination at the center of the light source 74 and a higher illumination at both ends, which can compensate for the weaker light intensity around the CCD, so that the optical coupling element module (CCDM) can be generated. A uniform intensity image signal. As shown in Fig. 3, U.S. Patent No. 2,050,195,452, the disclosure of which is incorporated herein by reference. In order to improve the uniformity of the sub-scanning direction, the illumination of the emitted light on the document to be scanned can form a uniform or U-shaped illuminance distribution, so as to replace the φ CCFL in the high-speed scanner. However, the use of technologies such as LED arrays at the rear end of the light guide requires many LED units and complicated controls. Another technical solution is to arrange the light source on the end surface of the light guide body. As shown in FIG. 4, an end cap 81 is disposed at the light emitting end to prevent most of the light from coming out from the end surface, and in the polygonal shape. The light guiding body 82 is provided with a reflective tooth 82 so that the light emitted by the light source can be sufficiently reflected to increase the utilization of the light, and the distance between the teeth and the tooth shape is adjusted to adjust the light emitted by the light. type. However, the polygonal light guide body and the different tooth-shaped pitch increase the manufacturing difficulty, and it is difficult to reduce the 201109588. Therefore, in order to simplify manufacturing and reduce cost, an LED light source is disposed on the end surface of the light guide to reduce the amount of LED used, and is convenient for manufacturing, and a U-shaped illuminance distribution complementary to the document image is formed on the exit surface in the sub-scanning direction. The scanning direction forms a linearly concentrated illuminance distribution that will be used for high resolution and high speed scanning purposes. SUMMARY OF THE INVENTION An object of the present invention is to provide a linear light source having a prismatic rib reflecting surface light guide body, which is applied to an optical coupling element module (CCDM) having an image capturing lens and a CCD image sensor, and a linear light source. The invention comprises a light guide body, a reflective cover and two light emitting diodes (LEDs); wherein the light guiding system is made of an optical material, and has an incident surface, a reflecting surface, a birefringent surface and an emitting surface, and the reflecting surface and the emitting surface Correspondingly, the light-emitting diodes (LEDs) are disposed on the incident surfaces at both ends of the light guide body; the two refractive surfaces are respectively disposed on both sides of the reflective surface; the reflective surface of the light guide body has a plurality of prismatic rib structures Each prismatic rib structure is provided with an angled surface, and the light incident on the reflecting surface of the light guiding body is reflected to the emitting surface by the reflecting surface; the emitting surface is convex in the main scanning direction, and the convex surface is facing the object side; The light emitted by the diode (LED) enters from the incident surface, is reflected by the reflective surface, and is refracted by the refracting surface. After being emitted from the exit surface, it can be in the main scanning direction on the object to be illuminated (such as a document to be scanned). ) A linear convergence illuminance distribution forms a U-shaped illumination distribution in the sub-scanning direction to compensate for the weaker intensity of the light around the CCD 201109588, forming a complementary effect to produce a uniform light intensity image signal. . Another object of the present invention is to provide an incident concave surface on the incident surface of the light guide body. The center of the concave surface of the human light is located on the central sleeve of the two light emitting diodes, and the optical axis of the line is used to improve the light guiding efficiency. Reduce light scatter and increase the average illuminance of the light-emitting body exit surface. Still another object of the present invention is to provide a concave surface in the sub-scanning direction on the exit surface of the light guide body, and a convex surface with respect to the light emission direction for further increasing the intensity of the illuminance at both ends of the light guide exit surface. Thus, the linear light source having the prismatic rib reflecting surface light guide of the present invention may have one or more of the following advantages: (1) The light guiding body of the prismatic rib reflecting surface proposed by the present invention The LED light source arranged on the incident surfaces on both sides can improve the shortcomings of the high cost and complicated control of the direct illumination method of the conventional LED using the LED. (2) With the prismatic rib reflecting surface of the light guiding body proposed by the present invention, a linearly concentrated illuminance distribution can be formed in the main scanning direction, and a u-shaped illuminance distribution can be formed in the sub-scanning direction to compensate for the CCD circumference. The phenomenon of weaker light intensity 'complements each other, producing a uniform light intensity image signal, providing high resolution, high speed scanning. (3) The structure of the light guide body provided with the concave surface on the exit surface (relative to the light exiting side (four) convex surface) or the concave surface of the human emitting surface can improve the light use efficiency and relatively increase the light intensity. MODE FOR CARRYING OUT THE INVENTION In order to make the present invention more clear and detailed, the preferred embodiments are illustrated and the following drawings are omitted. The structure and technical features of the present invention are described in detail below. = Referring to Fig. 5, it is a schematic view of a first embodiment of a linear light source having a prismatic rib reflecting surface according to the present invention. Please refer to Fig. 6 for the reflection of the linear light source having the prismatic rib reflecting surface light guide body of the present invention. Please refer to Fig. 7, which is a reflection of the embodiment of the present invention. The linear light source 1 comprises a light guide body 1 , a reflective cover 个 a light emitting diode (LED) (11a, 11b), wherein the light guide body 1 is made of a material of a prior art, and has a human face. 15. Reflecting surface 13, two refracting surface and emitting surface 12 'The reflecting surface 13 is arranged corresponding to the emitting surface 12, and the light emitting diodes (LED) (1) a, Ub) are disposed on the incident surface 15 at both ends of the light guiding body 1 () The two refractive surfaces 17 are respectively disposed on both sides of the reflecting surface 13 for refracting the first line. The exit surface 12 is a convex surface in the main scanning direction (γ direction), and the convex surface is the object-facing side, and the radius of curvature is . The reflecting surface 13 of the light guiding body 10 has a plurality of prismatic ribs and a prismatic rib m structure, and all the corner surfaces 132 are provided, and the light incident on the reflecting surface 13 of the light guiding body 10 is reflected by the opposite surface. To the exit surface 12, as shown in Figs. 8 to 1011; wherein, the angle of the Chamfer angle is the angle formed by the cut surface 132 and the reflective surface 13, and c is the chamfered surface %2. The projection length in the scanning direction, W is the width of the light guiding body 1〇 in the main scanning direction, d is the distance between the two toothed reflecting ribs, and η is the reflecting surface 13 to the length of the vertex of the emitting surface 12' is the height of the light guiding rod , Ηζ is the length of the bottom of the prismatic rib to the apex of the exit surface 12. The relationship is as follows:
Hz = H + c sin0 (1) 201109588 ec=c〇s-\^m) ' 2c ) (2) 進一步，入射面15可設有一入射凹面16a、l6b， 該入射凹面16a、16b面向於發光二極體（LED)(lla、Ub) 側，該入射面15的入射凹面16a、16b之中心位於該二 個發光二極體(LED)(lla、llb)中心軸連線之光軸上，其 曲率半徑分別為R10a、Ri0b。其入射凹面16a、16b在入 射面15的直徑為E)C，係配合發光二極體lu、nb的 徑所設置。 眷 再進一步，在副掃描方向（X方向），出射面12可設 置為一凹面，其曲率半徑為Rux，可將副掃描方向射出 出射面12的光線照度分佈更為聚集。 反射蓋18為U形槽，可以容置導光體1〇，u形槽 為金屬所製或具有反射層，可以將穿透出導光體1〇之光 線反射’進入導光體10 ;反射蓋18進一步包含二個端蓋 (181a、181b)，用以遮蔽非作用區的光線。 Φ 本發明具有稜形齒肋尽射面導光體10為光學材料 所製成，光學材料的折射率（refractive index)nd大於空氣 的折射率1.0，當LED發出光線後，光線經由兩端入射 面15進入導光體1〇,由於導光體1〇的折射率…大於空 氣的折射率1.0’進入導光體的光線在臨界角度 (critical angle)内，只會產生折射而不會產生穿出導光體 10;若穿出導光體10的光線，則由反射蓋18折射進入 導光體10。如第11圖，由於LED發出的每條光線角度 不同，在導光體10内的光線若射至反射面13，藉由反 201109588 ^面13的棱形㈣131結構可將光線反射。由副掃描方 向彳LED發出的光線21進入導光體ι〇射至反射面 13,光線21被棱形齒肋131反射至出射面12，形成光 2 21,;若光線22以小於反射臨界角射至導光HH)折射 =丄7 ’被折射S i 7折射後射至反射面工3，光線2 2被稜 形齒肋m反射至出射面12，形成光線22，；藉由本發 明的導光體H)’在副掃描方向’接近導光體1()二端的 入射面15,射出出射面12的光線照度較高，在中央部 份射出出射面12的光線照度較低，但藉由反射面㈣ 稜形齒肋131結構，使中央部份的照度可以提高形成 兩端較高中央較低且平的U形照度分佈。為達最佳效 果，兩個齒形反射面13的距離d、反射面13至出射面 a頂點的長度H(導光桿的高度）、稜形齒肋i3i底部至 出射面12頂點的長度Hz，則可依據導光體1〇光學材料 的折射率nd與導光體1〇在副掃描方向的長度L、發光 二極體的直徑等相互配合。 光耦合元件模組使用的CCD影像感測器為面感測 器（area sensor)，因受取像鏡頭光學鏡片的聚焦曲面影 I，在邊緣部份光線強度較弱，使面感測器產生的電子 訊號在邊緣部份較低，在中央部份產生的電子訊號較均 勻，若照射在被照物體（如待掃描文件）的光線，在副掃 描方向為均勻的照度分佈時（如第丨圖），經由待掃描文 件反射後，被CCD影像感測器所接收，CCD影像感測 益所產生的影像訊號在兩端則會較弱（顏色較暗），寫真 程度（degree of realism)降低。若使用如第2圖或本發明 201109588 ‘產生的u形照度分佈時，CCD影像感測器所產生 =號在兩端則會提高’寫真程度（degree of realism；提 n，產生更好的解析度與影像電子訊號。 再如第12圖’由主掃描方向，光線以咖射出 後，被棱形齒肋131反射至出射面12，再經由出射面η 的凸面r】2聚集，形成光、線21，：若光線22 =射至導光體1〇折射面17，被折射面17折射後： 線22,1二=由出射面12的凸* Rl2聚集，形成光 ^ ，右先線23以大於反射臨界角射至導光體⑺ 將穿出導光體10,再被反射蓋18反射再 „Π)’若光線23射至反射面13之切角面= 日”光線23被切角面.132反射至出射面12，經 =告的凸面Rl2聚集形成光線24’；即藉由反射面^的 夂心肋131與切角面132可將入射的光線21、22 中Γ12,再經由出射面12的凸面^聚集成為 綠性集t (hnear convergence)的照度分佈。在 向，經由導光體10發出的光線，可 :性光束0一)，提供給影像掃描器、二=^ :效：’切角面132之切角角度…齒肋13f= Γ;;= 據導先艘10寬度w、光學材料的折射率二 出射面12的凸面的曲率半經R艿山 文件的距離等相互配合12及出射面12至被掃描Hz = H + c sin0 (1) 201109588 ec=c〇s-\^m) ' 2c ) (2) Further, the incident surface 15 may be provided with an incident concave surface 16a, 16b, which faces the light-emitting surface a body (LED) (lla, Ub) side, the center of the incident concave surface 16a, 16b of the incident surface 15 is located on the optical axis of the central axis of the two light emitting diodes (LED) (lla, 11b), The radius of curvature is R10a and Ri0b, respectively. The incident concave surfaces 16a, 16b have a diameter E) C on the incident surface 15, and are provided in accordance with the diameters of the light-emitting diodes lu and nb. Further, in the sub-scanning direction (X direction), the exit surface 12 can be set to a concave surface having a radius of curvature of Rux, and the illuminance distribution of the light emitted from the exit surface 12 in the sub-scanning direction can be more concentrated. The reflective cover 18 is a U-shaped groove, and can accommodate the light guide body 1 〇. The u-shaped groove is made of metal or has a reflective layer, and can reflect the light that penetrates the light guide body 1 ' into the light guide body 10; The cover 18 further includes two end caps (181a, 181b) for shielding the light in the inactive area. Φ The prism of the invention has a prismatic rib surface. The light guide body 10 is made of an optical material. The refractive index of the optical material is greater than the refractive index of the air of 1.0. When the LED emits light, the light is incident through both ends. The surface 15 enters the light guide body 1〇, since the refractive index of the light guide body 1〇 is greater than the refractive index of the air 1.0′, the light entering the light guide body is within a critical angle, and only refraction is generated without wearing The light guide body 10 is detached from the light guide body 10 by the reflection cover 18 when it passes through the light guide body 10. As shown in Fig. 11, since the light rays emitted from the LEDs are different from each other, the light rays in the light guide body 10 are incident on the reflecting surface 13, and the light rays are reflected by the prismatic (four) 131 structure of the surface of the surface of the surface. The light 21 emitted by the sub-scanning direction 彳LED enters the light guiding body ι to the reflecting surface 13, and the light ray 21 is reflected by the prismatic rib 131 to the exit surface 12 to form the light 2 21; if the light 22 is smaller than the critical angle of reflection射光光HH) Refraction = 丄7' is refracted by S i 7 and then incident on the reflective surface 3, and the light ray 2 is reflected by the prismatic rib m to the exit surface 12 to form the ray 22; The light body H) 'closes to the incident surface 15 at both ends of the light guide 1 () in the sub-scanning direction, the illuminance of the light exiting the exit surface 12 is high, and the illuminance of the light exiting the exit surface 12 at the central portion is low, but by Reflecting surface (4) The structure of the prismatic rib 131 allows the illuminance of the central portion to be increased to form a lower U-shaped illuminance distribution at the upper center. For the best effect, the distance d of the two toothed reflecting surfaces 13, the length H of the reflecting surface 13 to the vertex of the exit surface a (the height of the light guiding rod), the length Hz of the bottom of the prismatic rib i3i to the apex of the exit surface 12, The refractive index nd of the light guide body 1 与 is matched with the length L of the light guide body 1 〇 in the sub-scanning direction, the diameter of the light-emitting diode, and the like. The CCD image sensor used in the optical coupling component module is an area sensor. The intensity of the light at the edge portion is weak due to the focus surface I of the image lens of the lens, which is generated by the surface sensor. The electronic signal is lower at the edge portion, and the electronic signal generated at the central portion is relatively uniform. If the light is irradiated on the illuminated object (such as a document to be scanned), the uniform illumination distribution is in the sub-scanning direction (such as the first image). After being reflected by the file to be scanned, it is received by the CCD image sensor, and the image signal generated by the CCD image sensing is weaker at both ends (darker color), and the degree of realism is lowered. If the u-shaped illuminance distribution generated by Figure 2 or the invention 201109588' is used, the CCD image sensor produces the = sign at both ends to improve the 'degree of realism' (degree of realism; Degree and image electronic signal. As shown in Fig. 12, 'from the main scanning direction, after the light is emitted by the coffee, it is reflected by the prismatic rib 131 to the exit surface 12, and then concentrated by the convex surface r of the exit surface η to form light, Line 21: If the light 22 is incident on the refractive surface 17 of the light guide body 1 and is refracted by the refractive surface 17: Line 22, 1 2 = concentrated by the convex * Rl2 of the exit surface 12 to form light ^, right first line 23 When the light guide body (7) is larger than the reflection critical angle, it will pass through the light guide body 10, and then reflected by the reflection cover 18, and then the light beam 23 will be incident on the chamfer surface of the reflection surface 13 = day "light 23 is chamfered The surface 132 is reflected to the exit surface 12, and the convex surface R12 of the reflective surface is gathered to form the light ray 24'; that is, the ray ribs 131 and the chamfered surface 132 of the reflective surface can Γ12 the incident light rays 21, 22, and then The convex surface of the exit surface 12 is gathered to become an illuminance distribution of a green year convergence. In the direction of the light emitted by the light guide body 10, the light beam 0 can be supplied to the image scanner, and the effect is: the angle of cut of the angled surface 132... the rib 13f = Γ; According to the first ship width 10, the refractive index of the optical material, the curvature of the convex surface of the exit surface 12 is half-matched by the distance of the R-mountain file, etc. 12 and the exit surface 12 are scanned.
射面於說明及比較’以下實施例之具有稜形齒肋反 =導光體之線性光源^均係料A 景“象感測器之影像掃描器，待掃描文件寬度為 201109588 ±l〇5mm(210mm寬）；線性光源1包含一個導光體1〇、 一反射蓋18及二個發光二極體（LED)(lla、llb);發光 · 一極體（LED)(1 la、1 lb)使用尚亮度LED，當影像掃描器 啟動時，可發出白色的光線。使用的反射蓋18為不透明 塑膠（opaque plastic)所製，為u形槽狀，内表層鍍有鋁 反射膜層（aluminium reflection layer)，可以將穿透出導 光體10之光線反射進入導光體10;反射蓋18在導光桿 兩端設有二個端蓋（181a、181b)，用以遮蔽非作用區的 光線。為便於說明，下列各實施例均使用相同長度春 (L-260mm、士 130mm)、相同高度(H=6.5mm)、相同寬度 (W=6.2mm)的導光體10，出射面12至被掃描文件的距 離設為7mm，發光二極體iia、llb直徑為2 lmm，兩端 發光二極體lla、Ub發出光線後，經由二個寬度為i〇mm 的端蓋（181a、181b)遮蔽後，導光體1〇在副掃描方向（χ 方向）發出長度為士120mm的U形照度分佈的光線、在主 掃描方向（Y方向）發出線性集中的照度分佈的光線，以 照射被照物體（如待掃描文件）。上列之尺寸及數據僅為 舉例’但不以此為限。 零 請參閱第15圓至第22圖，其係為各實施例在被照 物體（距離為7mm)上的副掃描方向及主掃描方向，均方 根照度（root mean square illumination)與位置的照度分佈 圖，在副掃描方向顯示士14〇mm的長度（相對於被照物體 有效範圍為±105mm)'主掃描方向顯示土1〇mm的寬度（若 不考慮被光闌所遮斷、相對於被照物體有效範圍為 土2.5mm)。 12 201109588 〈第一貫施例> 凊參閱苐5圖，禆盍夫每 . ^ A ，、係為本實施例具有稜形齒肋反射 面導光體之線性光泝的早立固丄 .原的不思圖，在本實施例，導光體10 為光予材料聚碳酸醋ΓΡΓΆ也】# ,The surface is described and compared with the following example: a linear light source with a prismatic rib reverse = light guide body ^ is a material image A" image sensor of the sensor, the file width to be scanned is 201109588 ± l 〇 5mm (210mm wide); the linear light source 1 comprises a light guide body 1 , a reflective cover 18 and two light emitting diodes (LEDs) (lla, 11b); a light emitting body (LED) (1 la, 1 lb) Using the brightness LED, when the image scanner is activated, it can emit white light. The reflective cover 18 is made of opaque plastic, which is u-shaped groove, and the inner surface is coated with aluminum reflective film layer (aluminium) Reflection light), the light that penetrates the light guide body 10 can be reflected into the light guide body 10; the reflective cover 18 is provided with two end covers (181a, 181b) at both ends of the light guide rod for shielding the light in the non-active area For convenience of description, the following embodiments use the same length of spring (L-260mm, ± 130mm), the same height (H = 6.5mm), the same width (W = 6.2mm) of the light guide body 10, the exit surface 12 to The distance of the scanned document is set to 7mm, the diameter of the light-emitting diode iia, llb is 2 lmm, and the two ends of the light-emitting diodes 11a, U b, after the light is emitted, after being covered by two end caps (181a, 181b) having a width of i 〇 mm, the light guide body 1 发出 emits light of a U-shaped illuminance having a length of 120 mm in the sub-scanning direction (χ direction), A linearly concentrated illuminance distribution of light is emitted in the main scanning direction (Y direction) to illuminate the illuminated object (such as a file to be scanned). The dimensions and data listed above are for example only, but are not limited thereto. 15 to 22, which is the illuminance distribution of the root mean square illumination and the position in the sub-scanning direction and the main scanning direction of the illuminated object (distance of 7 mm) in each embodiment. The sub-scanning direction shows the length of ±14〇mm (the effective range is ±105mm with respect to the illuminated object)' The main scanning direction shows the width of the soil 1〇mm (if it is not considered to be blocked by the diaphragm, it is effective relative to the illuminated object) The range is soil 2.5mm). 12 201109588 <First embodiment> 凊 Refer to Figure 5, 禆盍夫. ^ A , is the linear light of the prism with the prismatic rib reflecting surface of this embodiment Tracing back to the early stage. The original is not thinking, in this embodiment The light guide member 10 to the optical polycarbonate material also ΓΡΓΆ #,
)製成’折射率（refractive index) nd=1.58，入射面15為一承；,A ^ 马千面、出射面12副掃描方向為 千面，導光體10相關參數如表一。 參數 折射率！!< 1.58 10.13The refractive index (refractive index) nd=1.58, the incident surface 15 is a bearing; the A ^ Ma Qian surface, the exit surface 12 sub-scanning direction is thousands of faces, and the relevant parameters of the light guiding body 10 are shown in Table 1. Parameter Refractive index! !< 1.58 10.13
0.55 掃描方向曲率半徑 出射面副掃描方向曲率丰0.55 scan radius of curvature radius of the exit surface
Ri2y(mm)__丁1工 切角面角度0 (dq 掃描方 0.55 6.84 d兩(上齒％反射肋的距離 gffgzf二至出射面頂點 <第二實施例> 請參閱第13圖’其係為太 面導光體之線性光源的二本實 ^ , 忍圖’在本實施例，導光體10 =材議，C)製成，折射率…，入射面 具有一凹面16，在屮私；^_ 光體10相關參數如表二。田掃描方向為平面’導 13 201109588 參數 1.58 -10.13 mi掃推徑 mi掃匕向曲率半徑Ri2y (mm) __ 1 working angle angle 0 (dq scanning side 0.55 6.84 d two (the distance between the upper teeth % reflecting ribs gffgzf two to the exit surface apex <second embodiment> see Figure 13' It is a two-dimensional real light source of a toroidal light guide body, which is made in the present embodiment, the light guide body 10 = material, C), the refractive index ..., the incident mask has a concave surface 16, in屮 ;; ^_ Light body 10 related parameters are shown in Table 2. Field scanning direction is the plane 'guide 13 201109588 Parameter 1.58 -10.13 mi sweep diameter mi broom radius of curvature
0.5 切角面角度 sifoif掃描方向的投影 d兩(m=〇齒形反射肋的距離 至出射面頂點 6.85 率半徑R“ 1.2 3.0 待知描文件設置於距離導光體i。兩端7麵處，本實 具有稜形齒肋反射面導光體之線性光源卜在距離 ^九體1〇兩端7麵處的照度分佈如第15圖、第16圖， 分別為副掃描方向之位置與照度關係圖與主掃描方向之 位置與照度的均方根值關係圖；由第15圖、帛16圖所 本實施例之線性光源丨可在待掃描文件上形成取像 鏡頭與CCD影像感測器互補效應的光源。 第三實施例> 請參閱第13圖’係為本實施例具有稜形齒肋反射面 201109588 導光體之線性弁调！ & -立^ 原、1的不意圖，在本實施例，導光體10 為光學材料聚甲基丙烯酸甲酷⑽MA)製成，折射率 人射面15具有一凹面16，在出射面12副掃描 方向為平面，導光體10相關參數如表三。 參數 1.49 MM 率 nH__ f射面气掃描方向曲率半 jM_2Y(mm) _ 守射面副掃描方向曲率丰 _^i2x( mm) 工 38.5 0.5 0.51 角度 影 的距離 f f f肋底部至出射面頂點 i 長度 Hz(mm)___’、 岔射面凹面曲率半徑尺…及 Kl6b 6.820.5 The angle of the chamfer surface angle sifoif scanning direction d two (m = the distance of the ridge-shaped reflecting rib to the exit surface vertex 6.85 rate radius R " 1.2 3.0 The document to be described is set at the distance light guide i. The illuminance distribution of the linear light source of the prismatic rib reflecting surface light guide body at the seven ends of the distance between the two ends of the body is as shown in Fig. 15 and Fig. 16, respectively, and the position and illumination of the sub-scanning direction are respectively The relationship between the position of the relationship diagram and the main scanning direction and the rms value of the illuminance; the linear light source of the embodiment of FIG. 15 and FIG. 16 can form the image capturing lens and the CCD image sensor on the document to be scanned. Light source of complementary effect. Third Embodiment> Referring to Fig. 13 ' is a linear ridge of the light guide rib reflecting surface 201109588 of this embodiment! & - the original intention of the original, 1 In the present embodiment, the light guide body 10 is made of an optical material polymethyl methacrylate (10) MA. The refractive index human surface 15 has a concave surface 16 which is planar in the sub-scanning direction of the exit surface 12, and the relevant parameters of the light guide body 10 As shown in Table 3. Parameter 1.49 MM rate nH__ f surface gas scanning direction curvature half jM_2Y(mm) _ Curtain surface sub-scanning direction curvature _^i2x(mm) 38.5 0.5 0.51 Angle of angle fff rib bottom to exit surface vertex i length Hz(mm)___', concave surface concave radius of curvature ...and Kl6b 6.82
3.0 實施例之具有稜形齒肋反射面導光體之線性光源 距離導光體1G兩端7mm處的照度分佈如第U圖、 18圖’分別為副掃描方向之位置與照度關係圖與主掃 田方向之位置與照度的均方根值關係圖；由第17圖和第 出圖所示’本實施Μ線性錢1可在待掃描文件上形 成取像鏡頭與CCD影㈣㈣互補效應的光源。 15 201109588 <第四實施例> 明：閱第14圖’為本實施例具有稜形齒肋反 :=線性光源1的示意圖，在本實施例，導光體10為 光學材料聚甲基丙烯酸甲醋(PMMA)製成，折射： 二射具有一凹面16,在出射面12副掃描 万向為凹面，導光體10相關參數如表四。 包例導光體相關參數 折射率h ___ ^射面主掃描方向曲率半徑 Ri2v(mm、_ 出射面副掃描方向曲率半徑 Ri2“mm、______ 刀角面角唐弋r^wj___ 謇今面在主掃描方向的投影 長度c(mm) ，個齒形反射肋的距離 d(mm)__ 稜形齒肋底部至出射面頂點 的長度Hz(mm)_______ 入射面凹面曲率半徑R16a及 Ri6h (mm)___ 入射面凹面首獲Dc (rnm)___ 1.49 -12.01 7175 37.5 0.8 0.55 7.0 -1.2 3.0 本實施例之具有稜形齒肋反射面導光體之線性光源 1，在距離導光體10兩端7mm處的照度分佈如第19圖、 第20圖，分別為副掃描方向之位置與照度關係圖與主掃 描方向之位置與照度的均方根值關係圖；由第19圖、第 20圖所示，本實施例之線性光源1可在待掃描文件上形 成取像鏡頭與CCD影像感測器互補效應的光源。 201109588 <第五實施例> 請參閱第14圖，係為太麻# , 導光體之線性光源！具有稜形齒肋反射面 為光聲姑缺的不思圖，在本實施例，導光體10 ^1； ^ ^ 光體1。相關參數如^射面12副掃描方向為凹面’導 ❿ 徑 向曲率半徑 115ϋ掃描方向的投影 1.58 -10.13 8512 6.85 -2.5 3.0 具有稜形齒肋反射面導光體之線性 導光體10兩端7mm處的照度分佈如第21圖、 圖’分別為副掃描方向之位置與照度關係圖與主掃 2;圖L之位置與照度的均方根值關係圖；由第21圖、第 斤不，本實施例之線性光源1可在待掃描文件上形 17 201109588 201109588 源 成取像鏡頭與CCD影像感測器互補效應的光 歸、’·内上述，本發明之具有稜形齒肋反射面導 線性光源之功效在於藉由稜形齒肢射 排於兩側入射面之LED光源，可在 導= 的照度分佈’在主掃描方向形成線性集中的昭度= 可提供給高解析度與高速掃描器使用。…、度刀佈 :上所述僅為舉例性’而非為 神與範，，而對其進行之等效= 更，均應包含於後附之中請專利㈣中。 欠 201109588 【圖式簡單說明】 第 1 圖 。之:為習知技藝之線性光源應用於影像掃 之不意圖； :係、為習知技藝之導光體一及照度分佈之示意圖; 第4^/ 糸為習知技藝之導光體三及照度分佈之示意圖； 弟4圖係、為習知技藝之導光體四之示意圖； 圖係為本發明具有稜形齒肋反射面導光體 光源第一實施例示意圖； 第6圖、係為本發明具有稜形齒肋反射面導光體之線性 光源之反射面示意圖； __ 圖係為本發明實施例之反射蓋示意圖；. 第 8 、 圖/系為本發明實施例之導光體透視詳圖（僅為一 段）； 第9圖係為第10圖之Α-Α，截面圖； 第10圖係為第1〇圖之Β_Β，截面圖； 第11圖係'為本發明實施例在副掃描方向入射光線反射 形成U形照度分佈示意圖； 2圖係為本發明實施例在主掃描方向入射光線反射 形成線性集中照度分佈示意圖； 第13圖係為本發明具有稜形齒肋反射面導光體之線性 光源第二實施例示意圖； 第14圖係為本發明具有稜形齒肋反射面導光體之線性 201109588 第15 第16 第17 第18 第19 第20 第21 第22 光源第三實施例示意圖； 圖係為第二實施例導光體出射面7mm處副掃描方 ' 向之位置與照度關係圖；. 圖係為第二實施例導光體出射面7mm處主掃描方 向之位置與照度的均方根值關係圖； 圖係為第三實施例導光體出射面7mm處副婦描方 向之位置與照度的均方根值關係圖； 圖係為第三實施例導光體出射面7mm處主掃描方 向之位置與照度的均方根值關係圖； ® 圖係為第四實施例導光體出射面7mm處副掃描方 向之位置與照度的均方根值關係圖； 圖係為第四實施例導光體出射面7mm處主掃描方 向之位置與照度的均方根值關係圖； 圖係為第五實施例導光體出射面7mm處副掃描方 向之位置與照度關係圖；以及 圖係為第五實施例導光體出射面7mm處主掃描方 _ 向之位置與照度的均方根值關係圖。 20 201109588 . 【主要元件符號說明】 1 :線性光源（linear light source); 10 :導光體（light guide); 11a、lib :發光二極體（LED); 12 :出射面（ejective surface); 13 :反身十面（reflection surface); • 131 :稜形齒肋(taped sawtooth); 132 :切角面； 15 :入身十面（incident surface); 16(16a、16b):入射凹面（incident concavity); 17 :折射面（refractive surface) 18 :反射蓋（reflective cartridge); 181a、181b:端蓋（end cap); φ 21、22、23 :光線(light); 21’、22’、23’ ：光線（source light); 55 :文件（document); 71 :氤氣燈管（xenon lamp); 72 :燈管電極（Lamp electrode); 73 :照度分佈（illumination distribution); 74 :光源中心（center of light source); 81 :端蓋（end cap); 21 201109588 82 :多角形的導光體（polygonal light guide); 821 :齒狀反射面（reflective tooth); 91 · LED 陣列（LED Array); 92 :柱面鏡（rod lens); 100 :光學引擎模組（optical engine module); 140 :反射鏡片組（reflection mirrors); 120 :取像鏡頭（pickup lens);以及 130 :影像感測器（image sensor)。 223.0 The illuminance distribution of the linear light source having the prismatic rib reflecting surface light guide body at a distance of 7 mm from both ends of the light guiding body 1G is as shown in the U-picture and FIG. 18' respectively, and the relationship between the position and the illuminance in the sub-scanning direction and the main The relationship between the position of the sweeping direction and the rms value of the illuminance; as shown in Fig. 17 and the first figure, the present embodiment can realize the complementary effect of the image capturing lens and the CCD shadow (4) (4) on the document to be scanned. . 15 201109588 <Fourth Embodiment> Ming: Fig. 14 is a schematic view of the embodiment having a prismatic rib reverse: = linear light source 1, in the present embodiment, the light guide body 10 is an optical material polymethyl group Made of acrylic acid vinegar (PMMA), refraction: two shots have a concave surface 16, and the outer surface of the exit surface 12 is concave and concave, and the relevant parameters of the light guide body 10 are shown in Table 4. Package example light guide body related parameter refractive index h ___ ^ face surface main scanning direction curvature radius Ri2v (mm, _ exit surface sub-scanning direction radius of curvature Ri2 "mm, ______ knife angle face angle Tang 弋 r ^ wj___ 謇 inside the main Projection length c (mm) in the scanning direction, distance d (mm) of a tooth-shaped reflecting rib __ length of the bottom of the prismatic rib to the apex of the exit surface Hz (mm) _______ concave radius of curvature of the incident surface R16a and Ri6h (mm)___ The concave surface of the incident surface is first obtained by Dc (rnm)___ 1.49 -12.01 7175 37.5 0.8 0.55 7.0 -1.2 3.0 The linear light source 1 having the prismatic rib reflecting surface light guide body of the embodiment is 7 mm from the ends of the light guiding body 10 The illuminance distribution is as shown in Fig. 19 and Fig. 20, which are the relationship between the position of the sub-scanning direction and the illuminance relationship diagram and the position of the main scanning direction and the rms value of the illuminance; as shown in Fig. 19 and Fig. 20, The linear light source 1 of the embodiment can form a light source for complementing the effect of the image capturing lens and the CCD image sensor on the document to be scanned. 201109588 <Fifth Embodiment> Please refer to Fig. 14, which is Taima#, guide Linear light source of light body! Reflective surface with prismatic ribs is not suitable for photoacoustic In the present embodiment, the light guide body 10 ^1; ^ ^ Light body 1. Related parameters such as the surface of the incident surface 12 is a concave surface guide ❿ Radial curvature radius 115 ϋ scan direction projection 1.58 -10.13 8512 6.85 - 2.5 3.0 The illuminance distribution at 7mm at both ends of the linear light guide body 10 having the prismatic rib reflecting surface light guide body is as shown in Fig. 21 and Fig. ' are respectively the position of the sub-scanning direction and the illuminance relationship diagram and the main sweep 2; The relationship between the position and the rms value of the illuminance; from the 21st, the jin, the linear light source 1 of the embodiment can be shaped on the document to be scanned 17 201109588 201109588 The source image capturing lens is complementary to the CCD image sensor The effect of the light return, '··In the above, the effect of the linear light source having the prismatic rib reflecting surface of the present invention is that the LED light source which is arranged on the incident surfaces of both sides by the prismatic tooth limb can be distributed in the illuminance of the guide = 'The formation of a linear concentration in the main scanning direction can be provided for high resolution and high speed scanners...., knives: the above is only an example 'not for God and Van, but for it Equivalent = more, should be included in the attached patent (4) Owe 201109588 [Simple description of the diagram] Figure 1 : The intention of applying the linear light source of the conventional technique to the image scanning; : The schematic diagram of the light guide body and the illumination distribution of the conventional technique; 4^ / 糸 is a schematic diagram of the light guide body 3 and the illuminance distribution of the conventional skill; the brother 4 is a schematic diagram of the light guide body 4 of the conventional skill; the figure is the light guide body light source with the prismatic rib reflecting surface of the invention BRIEF DESCRIPTION OF THE DRAWINGS FIG. 6 is a schematic view showing a reflecting surface of a linear light source having a prismatic rib reflecting surface light guide; FIG. 6 is a schematic view of a reflecting cover according to an embodiment of the present invention; / is a detailed view of the light guide body of the embodiment of the present invention (only one section); the figure 9 is the Α-Α, sectional view of the 10th figure; the 10th figure is the 〇 Β of the 1st drawing, the sectional view 11 is a schematic diagram of a U-shaped illuminance distribution formed by reflection of incident light in a sub-scanning direction according to an embodiment of the present invention; 2 is a schematic diagram of a linear concentrated illuminance distribution formed by reflection of incident light in a main scanning direction according to an embodiment of the present invention; Is a prismatic rib of the invention A schematic diagram of a second embodiment of a linear light source of an incident surface light guide; Fig. 14 is a linear diagram of a light guide body having a prismatic rib reflecting surface of the present invention 201109588 15th 16th 17th 18th 19th 20th 21st 22nd A schematic diagram of a third embodiment of the light source; the relationship between the position of the sub-scanning side of the light-emitting surface of the second embodiment and the illuminance; and the figure is the main scanning of the light-emitting surface of the second embodiment at 7 mm. The relationship between the position of the direction and the rms value of the illuminance; the graph is the rms relationship between the position of the sorrow direction and the illuminance at 7 mm of the exit surface of the light guide of the third embodiment; the figure is the third embodiment The relationship between the position of the main scanning direction at 7 mm of the light-emitting surface of the light guide and the rms value of the illuminance; ® is the RMS value of the position of the sub-scanning direction at 7 mm from the exit surface of the light guide of the fourth embodiment and the illuminance Figure is a diagram showing the relationship between the position of the main scanning direction and the rms value of the illuminance at 7 mm from the exit surface of the light guide of the fourth embodiment; the figure is the position of the sub-scanning direction at 7 mm of the exit surface of the light guide of the fifth embodiment. Relationship with illumination; and the diagram is the fifth embodiment The relationship between the position of the main scanning side and the rms value of the illuminance at 7 mm from the exit surface of the light body. 20 201109588 . [Main component symbol description] 1 : linear light source; 10 : light guide; 11a, lib: light-emitting diode (LED); 12: ejective surface; 13: reflection surface; • 131: taped sawtooth; 132: chamfered surface; 15: incident surface; 16 (16a, 16b): incident concave (incident Concavity); 17 : refractive surface 18: reflective cartridge; 181a, 181b: end cap; φ 21, 22, 23: light; 21', 22', 23 ' : light source; 55 : document; 71 : xenon lamp; 72 : lamp electrode; 73 : illumination distribution; 74 : light source center ( Center of light source); 81 : end cap; 21 201109588 82 : polygonal light guide; 821 : reflective tooth; 91 · LED array 92: rod lens; 100: optical engine module; 140: reflective lens group reflection mirrors); 120: imaging lens (pickup lens); and 130: image sensor (image sensor). twenty two